Busbar and electrical switching device having busbar

Abstract

The invention relates to a busbar of an electrical switching device, comprising a first connection terminal (31), which is designed to be directly or indirectly electrically conductively connected to a voltage tap of a battery cell of a battery module, and a second connection terminal (32), which is designed to be directly or indirectly electrically conductively connected to a total voltage tap of the battery module, the busbar (1) further comprises an electrically and thermally conductive metal conductor (2) which is connected to the first connection terminal (31) and / or the second connection terminal (32) and / or forms the first connection terminal (31) and / or the second connection terminal (32), the metal conductor (2) forming a third connection terminal (33) between the first connection terminal (31) and the second connection terminal (32), the third terminal is designed to be indirectly or directly connected to the temperature control body in a thermally conductive manner.

Description

Technical Field

[0001] The invention proceeds from a busbar of the type specified in the independent claim. The invention also relates to an electrical switching device having such a busbar. Background Art

[0002] Electrical switching devices, such as relays, are usually arranged between voltage taps of battery cells arranged at the ends of a battery module and a total voltage tap of the battery module and are used in principle for switching battery modules or batteries containing such battery modules.

[0003] In principle, such electrical switching devices should be actively cooled, in particular since they carry the entire current of the battery module. Summary of the invention

[0004] The busbar with the features of the independent claim offers the advantage that reliable current transmission and heat dissipation can be achieved. In particular, by selecting appropriate geometric dimensions, the electrical connection of the first terminal and the second terminal via the busbar can be used simultaneously for heat dissipation without increasing the size of the busbar. As a result, neither the path for the current nor the path for heat dissipation is unnecessarily large.

[0005] For this purpose, according to the invention, a busbar for an electrical switching device, in particular a relay, is provided.

[0006] In this case, the busbar comprises a first connecting terminal which is designed for direct or indirect electrically conductive connection to a voltage tap of a battery cell of the battery module.

[0007] In this case, the busbar comprises a second terminal which is designed for direct or indirect electrically conductive connection to a total voltage tap of the battery module.

[0008] In addition, the busbar further comprises an electrically and thermally conductive metal conductor, which is connected to the first connecting terminal and / or the second connecting terminal and / or forms the first connecting terminal and / or the second connecting terminal.

[0009] Between the first terminal and the second terminal, the metal conductor forms a third terminal. The third terminal is configured to be indirectly or directly thermally connected to the temperature control body. Especially on the cooling body.

[0010] Advantageous developments and improvements of the device specified in the independent claim are achieved by the measures listed in the dependent claims.

[0011] In general, the embodiment of the busbar according to the invention allows for reliable simultaneous transmission of current and heat. In particular, current can be transmitted between the first terminal and the second terminal, and heat can be dissipated via the third terminal. In particular, the heat generated by the current flow can be actively dissipated by the electrical switching device to a temperature control element, such as a cooling plate.

[0012] At this point it should be noted that a direct conductive connection is to be understood as a direct mechanical connection of the element to be contacted to the first terminal or the second terminal. For example, the first terminal can be connected to the voltage tap of the battery cell of the battery module in mechanical contact and / or the second terminal can be connected to the total voltage tap of the battery module.

[0013] An indirect conductive connection is understood to mean that a further element is arranged between the element to be contacted and the first terminal or the second terminal, which establishes the conductive connection. For example, a fuse can also be arranged between the second terminal and the total voltage tap of the battery module.

[0014] It should also be noted that a direct heat-conducting connection is to be understood as the third terminal and the temperature control body being connected to each other in mechanical contact, and an indirect heat-conducting connection is to be understood as a further element being arranged between the third terminal and the temperature control body.

[0015] Advantageously, the metal conductor is made of aluminum and / or copper. This has the advantage that particularly reliable electrical and thermal lines can be formed.

[0016] It is expedient for the metallic conductor to be surrounded by an insulating element at the region that cannot be electrically and / or thermally contacted. The insulating element is preferably made of plastic and is also designed to be electrically insulating.

[0017] Advantageously, the metallic conductor is injection-molded around with the insulating element.

[0018] It is also expedient if the insulating element delimits the third terminal. In other words, the third terminal can be formed or molded directly by the insulating element surrounding the metal conductor. In particular, the insulating element can form a frame in which the temperature control body can be accommodated. In particular, a defined area can be formed via which heat can be dissipated.

[0019] Advantageously, the third connecting terminal also includes a heat-conducting equalizing element. In particular, the heat-conducting equalizing element can be a so-called thermal interface material (English: thermisches Interface material), or TIM for short. As a result, heat can be reliably transferred between the temperature control body and the third connecting terminal. In particular, the heat-conducting equalizing material can be accommodated in an area or frame delimited by the insulating element and positioned thereby.

[0020] Furthermore, the layer thickness of the heat-conducting balancing material can be adjusted by the height of the delimitation or frame. Thus, the thermal resistance can be adjusted in a defined manner by means of this height in conjunction with the area of ​​the delimitation or frame.

[0021] Advantageously, the third connecting terminal further includes an electrically insulating insulating element, thereby making it possible to reliably insulate the third connecting terminal.

[0022] The busbar expediently has a first section and a second section. In this case, the cross section of the first section is designed to be larger than the cross section of the second section. This makes it possible to additionally optimize the thermal resistance depending on the requirements and thus provide an optimized heat output. In particular, this makes it possible to form a cross section for heat output that is larger than required for current conduction. This makes it possible to save material, weight and costs, since the busbar or the metal conductor does not need to be adjusted over the entire length.

[0023] Here, the first section and the second section can be formed according to the heat flow to be discharged and the driving temperature difference. In particular, the metal conductor can be expanded locally as required to form a relatively small thermal resistance.

[0024] The invention also provides an electrical switching device, in particular a relay, having a busbar according to the invention described here.

[0025] Overall, the busbar according to the invention saves material, weight and costs. It is also possible to decouple the electrical and thermal interfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.

[0027] in:

[0028] Figure 1 A first embodiment of a busbar according to the invention is shown in a perspective view.

[0029] Figure 2 A first embodiment of a busbar according to the invention is shown in cross section.

[0030] Figure 3 A second embodiment of a busbar according to the invention is shown in a perspective view.

[0031] Figure 4 A second embodiment of a busbar according to the invention is shown in cross section.

[0032] Figure 5 A second embodiment of the busbar according to the invention is shown in the detail view, and

[0033] Figure 6A third embodiment of a busbar according to the invention is shown in a perspective view. DETAILED DESCRIPTION

[0034] Figure 1 and 2 A first embodiment of a busbar 1 according to the invention is shown in a perspective view and in a sectional view.

[0035] The busbar 1 comprises a first connecting terminal 31 which is designed for direct or indirect electrically conductive connection to a voltage tap of a battery cell of a battery module.

[0036] The busbar 1 comprises a second terminal 32 which is designed for direct or indirect electrically conductive connection to a total voltage tap of the battery module.

[0037] Here, the busbar 1 also includes an electrically and thermally conductive metal conductor 2. In particular, the metal conductor 2 is made of aluminum and / or copper. The metal conductor 2 is made of Figure 1 and 2 The exemplary embodiment of the busbar 1 shown in FIG. 1 forms a first terminal 31 and a second terminal 32 .

[0038] Furthermore, the metallic conductor 2 comprises a third terminal 33 between the first terminal 31 and the second terminal 32 , which terminal 33 is designed for indirect or direct thermal connection to a temperature control body, in particular a cooling body such as a cooling plate.

[0039] In the region 4 in which no electrical and / or thermal contact is possible, the metal conductor 2 is surrounded by an insulating element 5. The insulating element 5 is preferably made of plastic and is designed to be electrically insulating. Figure 1 and 2 In the first exemplary embodiment shown in FIG. 1 , the metallic conductor 2 is designed to be surrounded by an insulating element 5 by injection molding. In particular, the insulating element 5 delimits the third connecting terminal 33 .

[0040] The third connecting terminal 33 further comprises a thermally conductive equalizing element 8. Furthermore, the third connecting terminal 33 comprises an insulating element 9 which is electrically insulating.

[0041] Figure 2 Also shown are the current flow 6 from the first connecting terminal 31 to the second connecting terminal 32 and the heat output 7 from the first connecting terminal 31 to the third connecting terminal 33 .

[0042] Figures 3 to 5 A second embodiment of a busbar 1 according to the invention is shown.

[0043] according to Figures 3 to 5 The busbar 1 of the second embodiment is Figure 1 and 2The first embodiment differs from the first embodiment in that the busbar 1 has a first section 11 with a first cross section 110 and a second section 12 with a second cross section 120. The first cross section 110 and the second cross section 120 are each arranged perpendicularly to the longitudinal direction 10 of the busbar 1. The first cross section 110 is larger than the second cross section 120. In particular, the first section 11 has a cross section enlarged compared to the second section 12.

[0044] In this case, the first section 11 is preferably arranged between the first connection terminal 31 and the third connection terminal 33 , so that a reliable heat transfer 7 is achieved.

[0045] In particular, the first section 11 has in this case a first height 111, which is, for example, 4 mm, and the second section 12 has a second height 121, which is, for example, 2 mm. The first height 111 is in this case greater than the second height 121. Thus, a cross-sectional enlargement can be easily formed by increasing the first height 111 compared to the second height 121.

[0046] Such a first height 111 which is greater than the smaller second height 121 can be formed, for example, by a plurality of materially bonded and thus heat-conducting layers of the metallic conductor 2 which are preferably connected by means of welding, rolling or soldering.

[0047] Figure 6 A third embodiment of a busbar 1 according to the invention is shown in a perspective view.

[0048] according to Figure 6 The third implementation method and according to Figures 3 to 5 The second embodiment differs from the first embodiment in that the first section 11 has a first width 112 and the second section 12 has a second width 122 . In this case, the first width 112 is greater than the second width 122 .

Claims

1. A busbar of an electrical switching device, in particular a relay, comprising: a first connecting terminal (31) which is designed to be directly or indirectly electrically conductively connected to a voltage tap of a battery cell of the battery module, and a second connecting terminal (32), which is designed to be directly or indirectly electrically conductively connected to a total voltage tap of the battery module, in, The busbar (1) further comprises an electrically and thermally conductive metal conductor (2), the metal conductor being connected to the first connecting terminal (31) and / or the second connecting terminal (32), and / or the metal conductor forming the first connecting terminal (31) and / or the second connecting terminal (32), It is characterized in that The metal conductor (2) forms a third connection terminal (33) between the first connection terminal (31) and the second connection terminal (32), the third connection terminal being designed for indirect or direct thermal connection to a temperature control body, in particular a cooling body such as a cooling plate.

2. The busbar according to claim 1, characterized in that The metal conductor (2) is made of aluminum and / or copper.

3. The busbar according to any one of the preceding claims 1 to 2, characterized in that The metal conductor (2) is surrounded by an insulating element (5) made of plastic and electrically insulating in an area (4) not capable of electrical and / or thermal contact, wherein the metal conductor (2) is in particular designed to be injection-molded around the insulating element (5).

4. The busbar according to claim 3, characterized in that The insulating element (5) delimits the third connecting terminal (33).

5. The busbar according to any one of the preceding claims 1 to 4, characterized in that The third connecting terminal (33) also includes a heat-conducting equalizing element (8).

6. The busbar according to any one of the preceding claims 1 to 5, characterized in that The third connecting terminal (33) further comprises an electrically insulating insulating element (9).

7. The busbar according to any one of the preceding claims 1 to 6, characterized in that The busbar (1) has a first section (11) and a second section (12), wherein a cross section (110) of the first section (11) is larger than a cross section (120) of the second section (12).

8. An electrical switching device, in particular a relay, having a busbar (1) according to any one of claims 1 to 7.

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